Disclosed herein is an apparatus for purifying sewage and wastewater, including a general automatic impurity treating apparatus; a equalization tank; a distribution tank; a microbe contact tank provided with a rotary activated bacillus contactor comprising a reticular rotator comprising a flat fan-shaped body composed of a synthetic fiber, a first solidification portion 28 formed of Saran latex, which is placed on the body, a spacer insert hole, formed between the body and the first solidification portion and bored such that the hole is integrated with the body and the first solidification portion, and a second solidification portion, formed of Saran latex, which is provided in the spacer insert hole; a measuring tank; a bioreaction tank; a settling tank; a sludge thickener; an aerated liquid circulation pump connected to the bioreaction tank and circulating part of the sewage and wastewater discharged into the settling tank to the distribution tank and the measuring tank; and a sludge returning pump connected to the settling tank and returning part of sludge precipitated in the settling tank to the distribution tank and the measuring tank.